Engine Failure During Flight
Following an engine failure in ight, establish the best glide speed as soon as
possible. Feathering of the propeller should be accomplished at the discretion
of the pilot and is dependent upon individual circumstances. Selection of
maximum RPM will result in an increased gas generator windmilling speed,
for emergency restarts without the use of the starter. Feathering the propeller,
on the other hand, will provide the maximum glide distance.
When established in a proper glide toward a suitable landing zone, an effort
should be made to identify what caused the loss of engine power.
• A complete engine failure may be identied by abnormal engine
temperature and excessive vibration or mechanical noise, accompanied by
the loss of engine power.
• An engine ameout can be identied by a drop in ITT, Torque, and %
to rollback to minimum idle: 48-53%) may have similar
symptoms as a ameout, but a rollback can be corrected by using the
Emergency Power Lever to bypass the fuel control unit.
Flameout During Flight
A ameout may be the result of the engine running out of fuel, heavy rain
conditions, or unstable engine operation. Unstable engine operation, such as
a compressor surge, may be identied by an audible popping noise just prior
to ameout. Once the fuel supply has been restored to the engine, ignition is
provided, or the cause of unstable engine operation is eliminated, the engine
may be successfully restarted.
• The best method for restarting the engine in ight is to initiate the relight
procedure immediately after ameout occurs.
• Restarts should only be initiated if the pilot is certain the ameout was not
the result of a malfunction which could cause a hazard after relight.
• Regardless of airspeed and altitude, it is possible for the engine to be
restarted by merely turning on the ignition switch. In an emergency,
turn the ignition switch on immediately after ameout, provided the gas
generator speed remains above 52%. Under these circumstances, it is not
necessary to shut off fuel to the engine or feather the propeller. However,
the power lever should be retarded to the IDLE position.
If a ameout has occurred and the gas generator speed falls below 52%,
bring the fuel condition lever to the CUTOFF position prior to attempting an
airstart. Feathering of the propeller depends on individual circumstances and
should be accomplished at the discretion of the pilot. However, if the engine
oil pressure falls below 15 PSI, the propeller should be feathered.
CAUTION: Do not attempt to restart an engine which is known to have
completely failed.
WARNING: The pilot should determine the reason for power loss prior to
attempting an airstart.
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